Stephenson was drafted by the Kansas City Chiefs in the third round with the 74th overall pick Friday evening.
In 13 outings last year, he anchored an offensive line that only allowed 11 sacks all season.
Stephenson recorded 16 knockdowns against Texas A&M en route to earning honorable mention All-Big 12 by both the AP and coaches.
The 6-foot-6, 312-pounder started 10 of 14 games the previous season, playing 868 snaps while accumulating 103 knockdowns, which ranked second on the team.
He played in seven games as a reserve back in 2008 after redshirting his first season in 2007 and did not see any action in 2009.